Set RPG Free
RPG Free Format is the younger (and imho much sexier) version of your grandads RPG Fixed Format.
IBM branding has always managed to make a complete hash of things and this might explain why RPG/4 is sometimes called RPG/400 (if talking about it being column-based) and RPG/5 or RPG/free or RPG Freeformat or RPG/7 (referring to the IBM i Version you are on)
I wish IBM would use a better branding for their machines but... we have what we have... so this is RPG /FreeFormat: